This is result of months of investigations by the FAA into whether portable electronics, from mobile phones and handheld games to tablets and laptops posed any kind of risk of interference with avionics and other vital systems on airplanes. They released guidelines on Thursday stating that airlines should conduct “carrier-defined PED [personal electronic device] testing” to make sure that electronic frequencies don’t cause any such interference. JetBlue 2302 was declared ready to go, and Delta has announced that all 191 planes in their fleet have passed such an inspection.